As i was able to understand the issue from the description mentioned above, .pes files on your computer are now opening in Adobe Acrobat, is that correct?
Try setting the default program for .pes to the application you used to open .pes file in and see if that works.
Here are the steps: https://support.microsoft.com/en-us/help/18539/windows-7-change-default-programs (for Windows)
Which application were you using to open .pes files?
Which operating system is installed on the machine-Mac/Windows?
Awaiting your response.
This happens in the download of the files.
This is a problem in the download of files. Not opening them. They will not open because they say they are adobe files and they are not.
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As the default application for .pes file has been set to Acrobat Reader (which opens .pdf files), the downloaded pes files will also show the pdf icon.
1- Try locating one of the pes files on the computer>right-click>Properties
2- Click Change under Opens with
3- Check if you are getting the application which opens pes files.
4- If you recognize the application, select it and click OK